One of the mysteries of the English language finally explained.
1A story which purports to explain the origin or relate the early history of something; a myth.
2Science. An unfalsifiable and unprovable explanation for a phenomenon; especially one purporting to show why a particular trait or behaviour has been favoured by natural selection.
Late 19th century. From just so + story.
just-so story/ˌdʒʌst ˈsəʊ ˌstɔːri/
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